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| author | Hans Verkuil <hverkuil@xs4all.nl> | 2009-01-15 10:09:05 +0100 |
|---|---|---|
| committer | Hans Verkuil <hverkuil@xs4all.nl> | 2009-01-15 10:09:05 +0100 |
| commit | 21ddc1581a225df18d39e8742ced6d3d2bd89003 (patch) | |
| tree | fe1eacf771c262ba14519ab9b4b018b32ebbf5a5 /linux/Documentation | |
| parent | 5e9c7b1b42b68600cc50c26061636c43d202aaeb (diff) | |
| download | mediapointer-dvb-s2-21ddc1581a225df18d39e8742ced6d3d2bd89003.tar.gz mediapointer-dvb-s2-21ddc1581a225df18d39e8742ced6d3d2bd89003.tar.bz2 | |
v4l2 doc: explain why v4l2_device_unregister_subdev() has to be called.
From: Hans Verkuil <hverkuil@xs4all.nl>
Priority: normal
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Diffstat (limited to 'linux/Documentation')
| -rw-r--r-- | linux/Documentation/video4linux/v4l2-framework.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/linux/Documentation/video4linux/v4l2-framework.txt b/linux/Documentation/video4linux/v4l2-framework.txt index ff124374e..cc3506242 100644 --- a/linux/Documentation/video4linux/v4l2-framework.txt +++ b/linux/Documentation/video4linux/v4l2-framework.txt @@ -340,6 +340,12 @@ Make sure to call v4l2_device_unregister_subdev(sd) when the remove() callback is called. This will unregister the sub-device from the bridge driver. It is safe to call this even if the sub-device was never registered. +You need to do this because when the bridge driver destroys the i2c adapter +the remove() callbacks are called of the i2c devices on that adapter. +After that the corresponding v4l2_subdev structures are invalid, so they +have to be unregistered first. Calling v4l2_device_unregister_subdev(sd) +from the remove() callback ensures that this is always done correctly. + The bridge driver also has some helper functions it can use: |